/*
 * The MIT License
 *
 * Copyright 2014 David Rodenas Pico.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package edu.uoc.sd.fr14.imesg;

import java.io.Serializable;

import edu.uoc.sd.fr14.actors.Server;
import edu.uoc.sd.fr14.mesg.MessageForServer;
import edu.uoc.sd.fr14.mesg.TargetId;
import edu.uoc.sd.fr14.mesg.TargetedMessage;
import edu.uoc.sd.fr14.model.OpId;
import edu.uoc.sd.fr14.model.ServerId;


public class PrepareMessage extends TargetedMessage implements MessageForServer,Serializable {
	private static final long serialVersionUID = -1044873200813617238L;
    protected PrepareMessage() { this.op = null; this.from = null; } // for serializer
	
	private final OpId op;
    private final ServerId from;

    /**
     * Prepare message for a server.
     * 
     * @param target follower server that has to receive this message
     * @param op     operation id that we want to confirm
     * @param from   current leader server who is sending this message
     * @see Server#prepare(OpId, ServerId)
     */
    public PrepareMessage(TargetId target,OpId op, ServerId from) {
        super(target);
        if (op == null) throw new NullPointerException("Illegal argument: op cannot be null");
        if (from == null) throw new NullPointerException("Illegal argument: from cannot be null");        
        
        this.op = op;
        this.from = from;
    }
    
    @Override
    public void apply(Server server) {
        server.prepare(op, from);
    }

    @Override
    public String toString() {
        return "prepare("+op+","+from+")>"+getTarget();
    }

}
